Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4986b8aa422fe971ebde3086b29910979849396d1a61585098da317789cafbb9' 
  AND token = 'qzQ2kVtIasuUKmROJ3WccodNlqU2XKk6pEK4cDMLYkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}